Comment on 'The October 2005 Georgian Bay, Canada, Earthquake Sequence: Mafic Dykes and Their Role in the Mechanical Heterogeneity of Precambrian Crust' by S. Dineva, D. Eaton, S. Ma, and R. Mereu

摘要

It has been proposed (Dineva et al., 2007) that the location of upper to midcrustal earthquakes in the Canadian Precambrian shield is related to rheological differences between mafic dykes and country rock. We show that this hypothesis is critically dependent on assumed lithology, strain rate, and temperature, and consequently is not established with any level of confidence. Furthermore, it appears to lack self-consistency because it postulates earthquakes to occur in the ductile regime.